Boring bar



A. C. WENAK BORING BAR Filed Nov. 5, 1923 5.Sheets-Sheet 1 61am; 4 a5 .NVENTOR WITNESSE$ Oct. 2, 1928. 1 1,686,428

A. C. WENAK BORING BAR Filed Nov. 5, 1923 5 Sheets-Sheet 2 nivENToR ATTORNEY WTNESSES Oct 2, 1928. 1,686,428

A. C. WENAK BORING BAR Filed Nov. 5, 1925 5 Sheets-Sheet 3 A. 6. TV? Q71? INVENTOR ATTORNEY WITNESSES Patented Oct. 2, 1 928.

UNrren s 'mras ARCHIE CALVIN VVENAK, F MUSCATINE, IOWA.

' BORING BAR.

Application filed November 5, 1923. ,SeriatNo. 672,919.

This invention relates to a device for rebor ing cylinders and the like, the general ob eCt of the invention being to provide a cutter, a member carrying the same and means for rotating the member to causethe cutter to engage the object to be cut and means for feeding the member longitudmallyito br ng the cutter against new portions of the ob ect.

Another object of the invention is to provide means for moving the member long tudinally without rotating it so as to adpist the cutter to the work piece and remove it therefrom.

This invention also consists in certain other features of construction and in the combination and arrangement of the several parts, to be hereinafter fully described, illustrated in the accompanying drawings and'spec1fi. W cally pointed out in the appended claim. f In describing my invention in detail, reference will be had to the accompanying drawings wherein like characters denote like or corresponding parts throughout the several views, and in which u I Figure 1 is an elevation of the inventlon.

Figure 2 is a longitudinal sectional vlew through portions thereof.

Figure 3 is a section on line 33 of Figure 1.

Figure 4 is a View of the carrier for the cutter.

Figure 5 is a top plan view thereof. Figure 6 is a view of the holding ringfor, holdingthe cutter on the carrier. Figures 7 and 8 are Views of the cutter clamp and cutter. I

Figure 9 is a section on line 99 of Figure 5. i p Figure 10 is a section on line 1010 of Figure 1. H p

Figure 11 is a view of the screw shaft. Figure 12 is a view of the rotary member which carries the screw shaft. Figure'13 is a View of the crank for rotating the shaft. v

Figure 14 isla view of the lower bearmg bar. 7

Figure 15 is a view of the U-shaped clamp. Figure 16 is a view of one of the channel plates for engaging the clamp.

Figure 17 is a plan viewshowmg the gear- Figure 1-8 is a diagrammatic view showing how the parts are arranged to give the cylinder a tapered bore.

In these views, 1 indicates a housing which is split andthe split parts are connected together by the bolts 2. This housing has its lower, end enlarged to provide a chamber 3 and it is supported by the yoke4, the parts of which are held in clampingpositi on around the housing by the bolt 5 and this yoke is supported by the rods 6 which have their lower ends passing through the U-shaped member .7. which issujpported by the channel plates 8 held to the ends of the rods by 'the nuts S). A bearingbloek 10, preferably formed of ha rdwood and split for a portion of its length has a hole 11 therein which is adapted t'o be clamped around the member which it engages by meansofthe bolt 12 passing through the split 1301130118., The cylinder block is placedbetween the bottom of the housing and said,

bearing block and then the parts are clamped on the block by screwing up the nuts 9 on the rods 6 to bring the U-shaped'member 7 against the bearing block 10. A tubular member '13. is rotatably mounted in the housing and this member has a reduced lower end 14 which en-- gages the opening 11 in the bearing block 10' so that said member 13 has abearing for its upper part 1n the houslng 1 and a bearing for its lower' part in the bloc-k. The member is provided with a bore 15 in its upper part which forms a bearing for the plain part of a screw shaft 16 and it has aslot 17 in its mid- I dle portion into which the screw section of the shaft 16 projects. The tool head 18 is of cylindrical shape and fits aroundthe member 13 and is adjustable thereon by being split, as at 19, with the splitportions held together bythe bolts 20. A nut member 21 is held to the tool head by the screws 22'and the projection 23 which engages'ahole in the side of the head; This nut member is provided with a threaded bore 24 for receiving thethreaded part'of the shaft 16. Thus when the shaft is rotated the tool'head will be moved longitudinally on the member 13. The lower end of the head is provided with a recess 25 at one side thereof to receive the tool carrying block 26 which is held in place by the split ring 27, held to the bottom of the head by the bolts 28 and having its ends engaging recesses 29 in ill on a projectin part 32 thereof. Thus by adjustmg the bIock by means-of these screws the cutter 33 can be set to make cuts of different depths. This cutter is held tothe block by means of the-j aw 34which is held to the lower face of the block by the bolts 35,

said lower face of the block and the face of centering the device in the cylinder to be bored, and a gear 40 is connected with the upper end of the member 13, this gear being engaged by the pinion 41 on a stub shaft42 which is carried by a plate 43 bolted tothe top of the housing. Thisv shaft carries a second pinion 44 whichis engaged by a pinion 45 on a crank handle 46 which. is pivoted to the plate. This gear 44 also engages a gear 47 which'is keyed to the shaft 16 in such a manner that it can be easily removed from the shaft so thata second crank handle 48 can be placed on the end of the shaft to rotate the same without moving the member 13-.

In using the device, the tool head is first raised into the chamber 3 of the housing to permit the device to be placed on the cylinder block. After the device is clamped to the cylinder block, as before described, and the parts centered by the device 39, the shaft 16 is rotated by the crank 48 to lower the cutter head to bring the tool int-o cutting position.

The crank 48 isthen removed and the gear 47 substituted and then the device is actuated by the crank handle 46. This will rotate both the shaft 16 and the member 13 so that the tool head is fed downwardly through the. cylinder and at the same time rotated to cause the tool to engage all parts-of the cylinder walls.

I prefer to move the block by its adjusting.

' passes through the cylinder the gear 47. is removed and the crank 48 substituted therefore and then the shaft 16 is turned by this crank to bring the cutter head back to its starting point. The tool block is then adj'ust ed to make thefinishing out after which the gear 47 is put back in place and the cutter head fed through the cylinder again to'make the finishing cut.

1 This machine will accurately rebore cylinders and it is so simple in construction that it can be handled by unskilled labor, after the proper adjustments have been made.

A washer 50 is arranged on the part 14'of todo this the small part 14 of'thetuhu'lan member 13 is eccentric-allyarranged with. re

l'ation to the large part ofs'ai-d member, as shown by the lines a and b in Figure 18"; The

top and the lower bearings are seton' the line a so that the lower part ofthe member 13will travel in a circular path with this line a asi-t's axis. Thus as the tool head 18 travelsd'owm wardly it will be rotated in a circle, the diameterof which is gradually increasingsoras to give the cylinder the tapered bore, as shown at A in Figure 18 though it is to be understood that this is exaggerated in order to properly show the construction. In actual practice the lower part of this bore will be .001 offan'inch' larger than the top.

It is thoughtfrom the-foregoing description that the advantages and novel rf-eatures of my invention will be readily apparent.

I desire it'to be understood that'I' may make changes'in the construction and in" the 'comxbi nation and arrangement of the severaljparts, providedthat such changes fall. within the scope of the. appended claim. Y

What I claim is A device of the character'describ'edycomprising spaced supporting members, said members bein provided with communicating. semi-circu ar portions,.a housing member supported within the enclosure defined by the semi-circular portions, a. tubular member split for an appreciable portion'ofits'lengt h being carried within the housing, a. reduced exten-. sion depending from the lower end of thetu bular member, a bearingblock split for an appreciable portion of its length and having communication with an opening adapted to accommodate the lowermost end of the 6X-" tension, a shaft extended centrally of and threaded within the tubular member, a tool head carried by the tubularmember} and adapted to receive the threaded portion of the shaft to move the head longitudinally of and upon the tubular member, a cuttermember carried by andhorizontally disposed from the tool head, and means forimparting rotary movement to the tubular member and tool head.

' In testimony whereof I affixmy sighature.

ARCHIE GAININWENAIQ 

